The longest checkmate problem - 290 move

Otto Blathy was born in Tata, Hungary on August 11, 1860 and he is credited for creating a mate in 290 moves. This problem is the longest checkmate problem and Blathy won a prize for this work in 1929. The position is not legal (easy retro analysis) and it is easy to convert it to a legal position, but the original Blathy position is shown. The analysis/solution given here was done by Cyril Banderier in 1992 and has been online since 1998. Mr. Blathy died on September 26, 1939 in Budapest.

Otto Blathy was born in Tata, Hungary on August 11, 1860 and he is credited for creating a mate in 290 moves. This problem is the longest checkmate problem and Blathy won a prize for this work in 1929. The position is not legal (easy retro analysis) and it is easy to convert it to a legal position, but the original Blathy position is shown. The analysis/solution given here was done by Cyril Banderier in 1992 and has been online since 1998. Mr. Blathy died on September 26, 1939 in Budapest.